Disazo-dyestuff insoluble in water



United States Patent DISAZQ-DYESTUFF INSOLUBLE IN WATER Joachim Ribka,Offenbach (Main), Germany, assignor to Farbwerke HoechstAktiengesellschaft vormals Meister Lucius & Briining, Frankfurt am Main,Germany, a corporation of Germany No Drawing. Filed May 5, 1959, Ser.No. 811,009 Claims priority, application Germany May 23, 1958 1 Claim.(Cl. 260-176) I have found that a new valuable disazo-dyestutf insolublein water is obtained by coupling in substance, on

soluble in water. Owing to its good fastness to solvents and very goodfastness to light, this pigment is particularly suitable for coloringplastic masses, for graphic printing and for special technical fields ofthe lacquer, wallpaper and paper industry. The new dyestuff can also beapplied to textile materials by padding or pigment printing or it may beused for coloring natural and synthetic resins.

The following example serves to illustrate the invention, but it is notintended to limit it thereto, the parts being by weight.

Example 32.2 parts of 4,4'-diamino-2,2',5,5-tetrachlorodiphenyl aretetrazotized in the usual manner. The tetrazo solution so obtained isthen coupled in known manner with a suspension of 41 parts ofl-acetoacetylamino-2,4-dimethylbenzene in acetic acid prepared in thepresence of a reaction product of about 20 mols of ethylene oxide with 1mol of oleyl alcohol. After completion of the dyestufi formation, thedyestulf corresponding to the formula on, 01 or on. enigma. c o .CHN=NN=NC 11.0 o .NHGO H. to a a, 41H; 1 5H3 the fiber or on anothersubstratum the tetrazonium compound from 4,4-diamino 2,2',5,5tetrachlorodiphenyl with 1-acetoacetylamino-Z,4-dimethylbenzene.

The new dyestufl yields on vegetable fibers including those ofregenerated cellulose valuable yellow dyeings and prints according toknown dyeing and printing methods.

The dyestufi represents a greenish-yellow pigment inis filtered off withsuction, washed and dried. The dye- 35 stuif so obtained is a greenishyellow powder.

References Cited in the file of this patent UNITED STATES PATENTS2,657,204 De Lucia et al

